\begin{table}[H]
 \centering 
\begin{tabular}{|c|*{4}{c}|}
\hline
\diagbox{序号1}{序号2} & A & B & C& D \\
\hline
数字 & 1 & 2 & 3 & 4 \\
\hline
数字 & 2 & 4 & 6 & 8 \\
\hline
\end{tabular}
\caption{表格}\label{table}  
\end{table}
